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13337 - Disk requirments during OS/DB migtation
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Disk requirments during OS/DB migtation
Hi Dick,fortunately the guide is really wrong if it should contain "as large
as the database"!
Anyway, for exporting 4.6B, you need the 4.6D tools and guides.
The data is compressed with a winzip similar algorithm which would
indicate about factor 1:10 - 1:20.
But, as cluster tables and ABAP sources are compressed with this
algorithm already you can't compress that any more.
So, you get a mixture of that depending on your data.
My experience is that 10% IFS needs are sufficient and if it runs
bad 15% - I'm currently at a customer and doing this weekend 2
productive migrations again. So, about 60GB should be sufficient. As
you are having a large system you normally will have a lot free
space when SAP is down - and during the export SAP IS down. Then you
need to test this anyway and will see YOUR demand in DASD. So, you
will be fine.
But, all this knowledge should be "common knowledge" for every
certified migration consultant which is required for any migration
anyway. So, I could help you with this migration.
Regards
Volker
--- In DoNotReply@consolut.eu, "dkennedyie" <dkennedyZw...>
wrote:
> We will migrate our 46B R3 system from AS400 to Intel on SQL
server
> at the end of 2004.
>
> I am trying to work out my disk requirments on the source system
> during the migration (for export files) based on current disk used
> and expected growth from now to the migration date. At that time I
> expect the databse to be approx 425GB.
>
> The R/3 Heterogeneous System copy manual (section 4-2 Requirements
> and Restrictions)for 46B says that I need at least free disk equal
to
> the size of the database. If this is true I will need to do a disk
> upgrade before the migration.
>
> I am also told by several sources that the export files during the
> migration are compressed. If this is so why do I need disk equal
to
> the database size?.
>
> Can anyone share there experience or knowledege of how best to
> calculate the disk requirments.
>
> Thanks
>
> Dick
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